Quick back story - I'm 35 years old, I had my first and only child at aged 15, so my DC is about to turn 20 and has left for Uni. I have a dog and a long term partner who works away a lot of the year so I'm fairly independent and alone much of the time. I'm not very social (at all really) and tend to enjoy a quiet, simple life. I work from home and potter around with my dog.
The thing is, I have recently wondered what the hell I'm going to do for the next (potentially) 50 years?! 
...I definitely don't want anymore children but I've been a mother my whole adult life and now I am lost and a little bewildered by it all. I do intend to travel but other than that I have no concrete plans. I am not career driven and happy with my current home business so no plans to change that.
I don't really know what I'm trying to say but I just feel too young to have an empty nest. Most women my age that l know are busy juggling kids, marriage, work, school etc.
I used to think I would relish this time in my life, and I would if I could figure out what my next purpose is. I am by no means moaning about this next stage of life, I just don't know how to begin to navigate it and leave behind the only life I've ever known 
What would you be doing if you were me?